everytime i come up to a red light or have to completely stop, the car would hesitate when i step on the gas and sometimes it would just die out...in most cases it would start right back up but as soon as i put it in drive it would stutter and die...its throwing a p0171 code, also if i floor it the car wouldnt accelerate at all, the rpms would rev up but no acceleration, can someone please help me out, thanks (its an automatic)

 

You can start off by checking in your air box to see if any debris are blocking the map sensor...Is your car under warranty still? If so just bring it into the dealer.